When this argument is given, the selected text is written to an temp file like “\%tmp\%eetemp214.txt” and this path is given as parameter to the external tool. (For the whole file we can already use the arg $(FilenameEx) but some tools can not handle $(SelText) with multi lines)

Example Command: .toolstool.exe Argument: /P 3 /F $(TempFile)

and the command line is build like p:athtoEmEditortoolstool.exe /P 3 /F “\%tmp\%eetemp214.txt”